81309220

素因数分解:

$2^2\times 5^1\times {\mathrm{4065461}}^1$

素因数の和:4065470

約数の個数: 12

約数和(自身を含む): 170749404

約数和(自身を除く): 89440184

約数列:

[1, 2, 4, 5, 10, 20, 4065461, 8130922, 16261844, 20327305, 40654610, 81309220]

約数ペア:

[(1, 81309220), (2, 40654610), (4, 20327305), (5, 16261844), (10, 8130922), (20, 4065461)]